I have the so called text based "Guide" from Prima and BradyGames, the Gold loot chest locations are explained pretty well, with maps and photos, but the ghost locations are given though annoyingly vague hints. IE, one on the moon 1:Archer’s Line HINT: Acceleration. This turned out to be high up on the side of the massive particle accelerator , near where you spawn. from a collectors point of view, the guide is a nice thing to have but internet can tell you almost everything that the guide can. once i finish off the last few missions on venus and mars I am going to sit down with pstrophys youtube videos and walk through all ghosts and chests